Structure, electrical conducting and thermal expansion properties of Ln0.6Sr0.4Co0.2Fe0.8O3 (Ln=La, Pr, Nd, Sm) perovskite-type complex oxides

Xu, Qing; Huang, Duan‐Ping; Chen, Wen; Zhang, Feng; Wang, Bi-tao

doi:10.1016/j.jallcom.2006.04.005

Cited by 53 publications

(24 citation statements)

References 25 publications

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“…To ensure a pure perovskite phase, the combusted powder was calcined at 700°C. The GNP combustion synthesis of the powder has been previously reported [20]. SDC powder was synthesized by a ureacombustion method.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Zhao

Huang

et al. 2012

J Solid State Electrochem

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La 2 NiO 4+δ , 60 wt.% La 2 NiO 4+δ -40 wt.% La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ , and 60 wt.% La 2 NiO 4+δ -40 wt.% Ce 0.8 Sm 0.2 O 1.9 electrodes were prepared from fine powders on dense Ce 0.8 Sm 0.2 O 1.9 electrolyte substrates by screenprinting technique. Electrochemical impedance spectroscopy and chronopotentiometry techniques were employed to evaluate the electrochemical properties of the composite electrodes in comparison with the La 2 NiO 4+δ electrode. For the three electrodes, main electrode processes were resolved to be charge-transfer at the electrode/electrolyte interface and oxygen exchange on the electrode surface. The contribution of the surface oxygen exchange process was detected to be dominant for the overall electrode polarization. The addition of Ce 0.8 Sm 0.2 O 1.9 into La 2 NiO 4+δ was favorable for the charge transfer process whereas it was undesired for the surface oxygen exchange process. On comparison, adding La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ into La 2 NiO 4+δ was found to benefit both the two electrode processes. The La 2 NiO 4+δ -La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ composite electrode showed optimum electrochemical properties among the three electrodes. At 800°C, the composite electrode achieved a polarization resistance of 0.20 Ω cm 2 , an overpotential of 45 mV at a current density of 200 mA cm −2 , together with an exchange current density of ∼200 mA cm −2 .

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Section: Introductionmentioning

confidence: 99%

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Zhao

Huang

et al. 2012

J Solid State Electrochem

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“…The calcining temperature of the powder was 700°C. The details of the synthesis process have been described in our previous work [21]. Ce 0.8 Sm 0.2 O 2−δ (abbreviated as SDC hereafter) powder was synthesized by a urea-combustion method using reagent grade Ce(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O, and urea CO(NH 2 ) 2 as starting materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and electrode properties of La0.6Sr0.4Co0.2Fe0.8O3-δ spin-coated on Ce0.8Sm0.2O2−δ electrolyte

Zhao

Huang

et al. 2010

Ionics

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Fine and uniform La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ powder was synthesized by a glycine-nitrate combustion process. La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ electrodes were prepared on dense Ce 0.8 Sm 0.2 O 2−δ electrolyte substrates using a spin-coating technique by sintering at 900-1,000°C. The electrode properties of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ were investigated by electrochemical impedance spectroscopy and chronopotentiometry techniques with respect to preparation conditions and the resulting microstructures. The results indicate a significant effect of the microstructure on the electrode processes and polarization characteristics. The oxygen adsorption and dissociation process acted as a larger contribution to the overall electrode polarization R p in magnitude compared with the charge transfer process due to relatively low porosity levels of the electrodes. It was detected that the grain size of the electrodes exhibited a crucial role on the electrocatalytic reactivity. At 800°C, the electrode sintered at 950°C attained a polarization resistance of 0.18 Ω cm 2 , an overpotential of 27 mV at a current density of 200 mA cm −2 , and an exchange current density of 308 mA cm −2 .

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“…SmSFCr powders were synthesized using a glycinenitrate combustion process (GNP). 21 O, and glycine were used as the raw materials. The mole ratio of glycine to the total metal cation content was 2.5.…”

Section: Synthesis and Preparation Proceduresmentioning

confidence: 99%

“…19,20 It has been shown that reducing the size of A-site cations in pervoskite-type cathode materials is a viable strategy to lower their TECs. 21,22 Hence, it is expected that replacing the alkaline-earth or rare-earth cations (ie, Sr 2+ or La 3+ ) at the A-site of LSFCr by their counterparts with smaller sizes might be a solution to the TEC problem. We have surveyed the electrical conducting, thermal expansion, and electrocatalytic properties of La 1-x Ca x Fe 1y Cr y O 3-δ (x = 0.5-0.7, y = 0.1-0.3, LCFCr) perovskites, in which the Sr 2+ at the A-site of LSFCr was replaced with smaller Ca 2+ .…”

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confidence: 99%

Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

Xie

Xiao

et al. 2019

Int J Energy Res

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Summary Perovskite‐type (ABO3) complex oxides of Sm1‐xSrxFe0.7Cr0.3O3‐δ (x = 0.5‐0.7) series were prepared by a glycine‐nitrate combustion process. The crystal structure, oxygen nonstoichiometry, electrical conducting, thermal expansion, and electrocatalytic properties of Sm1‐xSrxFe0.7Cr0.3O3‐δ perovskites were inspected in view of their use as cathode materials for intermediate temperature solid oxide fuel cells (IT‐SOFCs). Changing the content of Sm3+ at the A‐site was demonstrated to be effective in tuning the structure and properties. The variation of the various properties with Sm3+ content was explained in relation to the corresponding evolution of the crystal structure and oxygen nonstoichiometry. Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ (x = 0.7) was determined to be the optimal composition in the Sm1‐xSrxFe0.7Cr0.3O3‐δ series based on a trade‐off between the thermal expansion and electrocatalytic properties. Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ ceramic specimen exhibited an electrical conductivity of approximately 40 S·cm−1 at 800°C and a thermal expansion coefficient of 14.1 × 10−6 K−1 averaged in the temperature range from 40°C to 1000°C. At 800°C in air, Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ electrode showed a cathodic polarization resistance of 0.19 Ω·cm2, a cathodic overpotential of 30 mV at current density of 200 mA·cm−2, and an exchange current density of 257 mA·cm−2. It is suggested that Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ is a potential candidate material for cathode of IT‐SOFCs in light of its overall properties.

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Structure, electrical conducting and thermal expansion properties of Ln0.6Sr0.4Co0.2Fe0.8O3 (Ln=La, Pr, Nd, Sm) perovskite-type complex oxides

Cited by 53 publications

References 25 publications

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Microstructure and electrode properties of La0.6Sr0.4Co0.2Fe0.8O3-δ spin-coated on Ce0.8Sm0.2O2−δ electrolyte

Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

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Structure, electrical conducting and thermal expansion properties of Ln0.6Sr0.4Co0.2Fe0.8O3 (Ln=La, Pr, Nd, Sm) perovskite-type complex oxides

Cited by 53 publications

References 25 publications

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Microstructure and electrode properties of La0.6Sr0.4Co0.2Fe0.8O3-δ spin-coated on Ce0.8Sm0.2O2−δ electrolyte

Property evaluation of Sm 1‐x Sr x Fe 0.7 Cr 0.3 O 3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

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Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells